You can do what i did , i didn't make them pay in any of the setting up costs , i built everything and i have free electricity , after building everything i charged them 1/3 of thier profits to host the rigs in my place and taking care of everything and the offer was fair enough for them.
i would never host anything if you are asking 33% of my revenue, this is stupid crazy man, would kill my profit 100% and roi would take much longer, and asking 33% isn't very different than mining with very expensive electricity, so why i should mine in your facility? i just keep mining with my expensive electricity
Let's say a really busy person wants to invest a million dollars into hash rate. He'll need to take time off to setup the facility, and perhaps manage the farm full time. He may not have the skills to do it himself and his time is valuable.
So he partners with a person who has the time and knowledge to manage his investment. It's similar to hedge funds where they charge 2% management fee + 20% performance (profits).
Not saying 33% is justifiable or anything, but just pointing out both parties can benefit from such arrangements. If electricity is free (say your partner hydroelectric power), 33% is OK imo. Simply send your partner cheap 290/380/390, poor hash/watt but great $/hash cards.
Also, in December last year an Rx 480 only made $1 a day, and it costed me $0.50 to run with my expensive electricity. That's 50% gone, not 33%.
what you say it's true when the profit is very low, but the profit now is high, one gpu is making $5 per day, if i give to him 33% i'm losing $50 a month for each gpu, this is crazy dude and much more than my current electricity